////////////////////////////////////////////////////////////////////////////////
/// @brief mutexes, locks and condition variables in win32
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2004-2012 triagens GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2011-2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#ifndef TRIAGENS_BASICS_C_LOCKS_WIN32_H
#define TRIAGENS_BASICS_C_LOCKS_WIN32_H 1

#include "BasicsC/common.h"

#ifdef TRI_HAVE_WIN32_THREADS

#ifdef __cplusplus
extern "C" {
#endif

// -----------------------------------------------------------------------------
// --SECTION--                                                      public types
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup Threading
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief mutex type
////////////////////////////////////////////////////////////////////////////////

typedef struct TRI_mutex_s {
  HANDLE _mutex;
}
TRI_mutex_t;

////////////////////////////////////////////////////////////////////////////////
/// @brief spin-lock type
////////////////////////////////////////////////////////////////////////////////

#define TRI_spin_t CRITICAL_SECTION

////////////////////////////////////////////////////////////////////////////////
/// @brief read-write-lock type
////////////////////////////////////////////////////////////////////////////////

typedef struct TRI_read_write_lock_s {
  HANDLE _writerEvent;
  HANDLE _readersEvent;

  int _readers;

  CRITICAL_SECTION _lockWriter;
  CRITICAL_SECTION _lockReaders;
}
TRI_read_write_lock_t;

////////////////////////////////////////////////////////////////////////////////
/// @brief condition variable
///
/// This is based on http://www.cs.wustl.edu/~schmidt/win32-cv-1.html.
////////////////////////////////////////////////////////////////////////////////

typedef struct TRI_condition_s {
  CRITICAL_SECTION _lockWaiters;

  bool _ownMutex;

  HANDLE _waitersDone;
  HANDLE _mutex;
  HANDLE _sema;

  int _waiters;
  bool _broadcast;
}
TRI_condition_t;

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

#ifdef __cplusplus
}
#endif

#endif

#endif

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